Solar panel



FIG. 1 is a perspective view of a solar panel showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is an enlarged left view thereof;

FIG. 5 is an enlarged right view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown on the drawings depict portions of the solar panel that form no part of the claimed design. 

CLAIM The ornamental design for solar panel, as shown and described. 